Welding flux for molten salt corrosion resistant nickel-base superalloy fusion welding

Abstract

The invention discloses a welding flux formolten salt corrosion resistant nickel-base superalloy fusion welding and belongs to the technical field of welding materials. The welding flux comprises the following components in percentage by weight: 0.03%-0.06% of C, 0.04%-0.10% of Mn, 0.3%-0.5% of Si, not greater than 0.10% of Cu, not greater than 0.20% of Co, not greater than 0.015% of P, not greater than 0.015% of S, 0.01%-0.05% of rare earth element, 1.0%-5.0% of Fe, 6.0%-8.0% of Cr, 12.0%-18.0% of Mo, not greater than 0.3% of Al, not greater than 0.2% of Ti, 1.0%-2.0% of Nb and the balance of Ni, wherein Ti+Nb+Al is not greater than 2%. The invention also discloses a welding material for molten salt corrosion resistant nickel-base superalloy fusion welding, a connecting method of a molten salt corrosion resistant nickel-base superalloy and a structural member of the molten salt corrosion resistant nickel-base superalloy. According to the welding flux for molten salt corrosion resistant nickel-base superalloy fusion welding, the toughness and the oxidation resistance of a welded joint can be effectively improved, the excellent molten salt corrosion resistance and the excellent high temperature mechanical property can be guaranteed, the usage demands of molten salt and radiation environments with high usage temperature and performance requirements can be satisfied, and the welding flux is suitable for welding of a molten salt reactor structural material.

Description

technical field [0001] The invention relates to the technical field of welding materials, in particular to a solder used for fusion welding of nickel-based superalloys resistant to molten salt corrosion. Background technique [0002] The molten salt reactor belongs to the fourth generation nuclear energy system, which has a series of unique advantages, including high inherent safety, flexible fuel cycle characteristics, availability of thorium-based fuel, and prevention of nuclear proliferation. However, due to the use of molten salt as the coolant, the structural materials of the molten salt reactor must be resistant to molten salt corrosion, high temperature and radiation interaction. Foreign alloys resistant to molten salt corrosion are mainly Hastelloy N alloys, and my country has also studied the corresponding domestic high-temperature nickel-based alloy-GH3535. In order to ensure that the welded structure has reliable high-temperature strength and has high-temperature...

AI Technical Summary

Problems solved by technology

[0003] Usually, in order to ensure that the high-temperature nickel-based alloy has the same molten salt corrosion resistance as the base metal, the main constituent elements of the solder must remain the same as the base metal, but due to the high content of Mo and Cr in the molten-salt corrosion-resistant nickel-based superalloy, The toughness of the weld will be lower than that of the base metal, resulting in increased weld crack susceptibility

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